pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-9734-TempleHill.ps) >>/Users/jc/w/tmp/Tune-9734-get.log 2>&1" returned status 256
http://john-chambers.us/~jc/music/abc/demo/Tunes/TempleHill.abc

Error exit status 256; here are some files to check:
[P=get.cgi V=1/1 B=0 scale=0.60 512x512 PNG]
filesizedescription
Coll_97342.log 270429 Log file, useful mostly for debugging
Coll_97343.log 141597 Log file, useful mostly for debugging
Coll_97345.log 270429 Log file, useful mostly for debugging
Tune-9734-TempleHill.abc 187 ABC music file with the extracted tune(s)
Tune-9734-TempleHill.ps 34330 PostScript
Tune-9734-TempleHill.txt 187 Plain-text file with the extracted tune(s)
Tune-9734-get.log 4114 Log file, useful mostly for debugging
These files should be available for 24 hours.